Rename PROXY_* options to MEDIA_PROXY_*

internal/mediaproxy/url.go

@@ -0,0 +1,70 @@
+// SPDX-FileCopyrightText: Copyright The Miniflux Authors. All rights reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+package mediaproxy // import "miniflux.app/v2/internal/mediaproxy"
+
+import (
+	"crypto/hmac"
+	"crypto/sha256"
+	"encoding/base64"
+	"log/slog"
+	"net/url"
+	"path"
+
+	"miniflux.app/v2/internal/http/route"
+
+	"github.com/gorilla/mux"
+
+	"miniflux.app/v2/internal/config"
+)
+
+func ProxifyRelativeURL(router *mux.Router, mediaURL string) string {
+	if mediaURL == "" {
+		return ""
+	}
+
+	if customProxyURL := config.Opts.MediaCustomProxyURL(); customProxyURL != "" {
+		return proxifyURLWithCustomProxy(mediaURL, customProxyURL)
+	}
+
+	mac := hmac.New(sha256.New, config.Opts.MediaProxyPrivateKey())
+	mac.Write([]byte(mediaURL))
+	digest := mac.Sum(nil)
+	return route.Path(router, "proxy", "encodedDigest", base64.URLEncoding.EncodeToString(digest), "encodedURL", base64.URLEncoding.EncodeToString([]byte(mediaURL)))
+}
+
+func ProxifyAbsoluteURL(router *mux.Router, host, mediaURL string) string {
+	if mediaURL == "" {
+		return ""
+	}
+
+	if customProxyURL := config.Opts.MediaCustomProxyURL(); customProxyURL != "" {
+		return proxifyURLWithCustomProxy(mediaURL, customProxyURL)
+	}
+
+	proxifiedUrl := ProxifyRelativeURL(router, mediaURL)
+	scheme := "http"
+	if config.Opts.HTTPS {
+		scheme = "https"
+	}
+
+	return scheme + "://" + host + proxifiedUrl
+}
+
+func proxifyURLWithCustomProxy(mediaURL, customProxyURL string) string {
+	if customProxyURL == "" {
+		return mediaURL
+	}
+
+	proxyUrl, err := url.Parse(customProxyURL)
+	if err != nil {
+		slog.Error("Incorrect custom media proxy URL",
+			slog.String("custom_proxy_url", customProxyURL),
+			slog.Any("error", err),
+		)
+		return mediaURL
+	}
+
+	proxyUrl.Path = path.Join(proxyUrl.Path, base64.URLEncoding.EncodeToString([]byte(mediaURL)))
+	return proxyUrl.String()
+}